K35.21
Header — not billableAcute appendicitis with generalized peritonitis, with abscess
The ICD-10 code for acute appendicitis with generalized peritonitis, with abscess is K35.21.
K35.21 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 3 more specific codes below.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- K35.20Acute appendicitis with generalized peritonitis, without abscessnon-billable header
- K35.21Acute appendicitis with generalized peritonitis, with abscessnon-billable header